DISPLAY DEVICE
A display device includes a first bitable display, a second display, and a bitable electrochromic member sandwiched between the first bitable display and the second display. The first bitable display is switchable between a transparent status and a displaying status. The electrochromic member is switchable between a transparent status and a color status under predetermined voltage, with a response time of the second display being less than 30 milliseconds.
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1. Field
The present disclosure relates to displays, and particularly to a compound display device.
2. Background
Displays in many electronic devices may be a single type of a liquid crystal display (LCD) or an organic light emitting display (OLED).
The components of the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments of the present disclosure.
The first display 10 is a bitable display. When a signal voltage is applied on the first display 10, the first display 10 displays a predetermined image, and when the signal voltage is dropped, the first display 10 keeps displaying the image until another signal voltage is applied. Further, the first display 10 can be switched between a transparent status and a displaying status under different predetermined driving voltages.
In this embodiment, the first display 10 can be an electrophoretic display.
The first display 10 can be other types of bitable displays, such as a bitable LCD.
The electrochromic member 20 also has a bitable character.
The third transparent substrate 203 and the fourth transparent substrate 204 can be glass substrates, sapphire substrates or flexible transparent substrate. In this embodiment, the third transparent substrate 203 is attached to the first display 10, and a surface of the third transparent substrate 203 is a smooth surface. The surface of the display 10 reflects light incident from the first display 10, making the first display display images. In other embodiments, the fourth transparent substrate 204 can be attached to the first display 10, and a surface of the fourth transparent substrate 204 is a smooth surface.
A material of the third transparent electrode layer 205 and the fourth transparent electrode layer 209 can be indium tin oxide (ITO). In this embodiment, the third transparent electrode layer 205 and the fourth transparent electrode layer 209 can be used as common electrodes.
The electrochromic layer 206 is made from an electrochromic material and can be controlled to switch between transparent status and a color displaying status via the third transparent electrode layer 205 and the fourth transparent electrode layer 209, such as tungsten trioxide (WO3), molybdenum oxide (MoO3), and iridium oxide (IrOx). In an oxidation state, the WO3, the MoO3 and the IrOx are transparent. In a redox state, the WO3 and the MoO3 are dark blue and the IrOx is black. Therefore, the electrochromic layer 206 can display predetermined color(s) or in a transparent status by applying different voltages between the third transparent electrode layer 205 and the fourth transparent electrode layer 209.
The ionic conduction layer 207 provides transmitting path of ions between the electrochromic layer 206 and the ion storage layer 208. The ionic conduction layer 207 can be made from a material of solid state electrolyte of high polymer.
The ion storage layer 208 stores ions to keep a balance of total charges in the electrochromic member 20.
In this embodiment, a response time of the second display 30 is less than 30 milliseconds, and particularly, the response time of the second display 30 can be less than 16 milliseconds. In this embodiment, the second display 30 is an LCD. The second display 30 includes an LCD panel 31 and a backlight module 32. A surface of the LCD panel 31 is attached to the electrochromic member 20. The second display 30 can be other types of displays having a high responding speed, such as an OLED and a plasma display.
In use, the first display 10 and the electrochromic member 20 are applied to display static images, and the second display 30 is applied to display dynamic images. Because of the bitable character, the first display 10 and the electrochromic member 20 can keep displaying a static image without power supply. When dynamic images is needed to display, a control signal is applied to the first display 10 and the electrochromic member 20 to make the first display 10 and the electrochromic member 20 at a transparent status, and then the second display 30 is powered on to display dynamic images. During the displaying action of the second display 30, the first display 10 and the electrochromic member 20 are powered off. Therefore, electrical energy is saved when the display device displays static images.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being exemplary embodiments of the disclosure.
Claims
1. A display device, comprising:
- a first bitable display, the first bitable display being switchable between a transparent status and a displaying status;
- a second display, a response time of the second display being less than 30 milliseconds; and
- a bitable electrochromic member sandwiched between the first bitable display and the second display, the electrochromic member being switchable between a transparent status and a color status under predetermined voltage.
2. The display device of claim 1, wherein the first bitable display is an electrophoretic display.
3. The display device of claim 1, wherein the first display is a bitable liquid crystal display (LCD).
4. The display device of claim 1, wherein the second display is an LCD.
5. The display device of claim 4, wherein the second display comprises an LCD panel and a backlight module, a surface of the LCD panel is attached on the electrochromic member.
6. The display device of claim 1, wherein the second display is selected from a group consisting of an organic light emitting display and a plasma display.
7. The display device of claim 1, wherein the electrochromic member comprises a first transparent electrode layer, a second transparent electrode layer, an electrochromic layer, an ionic conduction layer, and an ion storage layer, the ionic conduction layer is sandwiched between the electrochromic layer and the ion storage layer, the electrochromic layer is attached to the first transparent electrode layer, and the ion storage layer is attached to the second transparent electrode layer.
8. The display device of claim 7, wherein the electrochromic member comprises a first transparent substrate and a second transparent substrate, the first transparent electrode layer is formed on a surface of the first transparent substrate, and the second transparent electrode layer is formed on a surface of the second transparent substrate.
9. The display device of claim 8, wherein the first transparent substrate is attached to the first display and the second transparent substrate is attached to the second display.
10. The display device of claim 8, wherein the first transparent substrate is attached to the second display and the second transparent substrate is attached to the first display.
11. The display device of claim 7, wherein the first transparent electrode layer and the second transparent electrode layer are common electrodes.
Type: Application
Filed: Apr 28, 2014
Publication Date: Oct 30, 2014
Patent Grant number: 9329450
Applicant: HON HAI PRECISION INDUSTRY CO., LTD. (New Taipei)
Inventor: PO-CHOU CHEN (Tu-Cheng)
Application Number: 14/262,807
International Classification: G02F 1/153 (20060101); G02F 1/167 (20060101);